I think Swoosh's previous point was that even on the 1-seaters, the back of the removeable fuselage section is already as high as it can go in battroid mode. On the 1-seaters, it is exposed and is an eyesore, but on the 1D, it should be completely covered by the chest plate.
The only way to make a longer fuselage section work is to not push the nose up in battroid, which means the hip hatch would need to be moved up to line up with the swing bar. Which stinks, because the forward fuselage should be a different mold for the 2-seaters anyways, so these changes shouldn't be a big deal.